Developer builds low-allocation HTTP library for ESP32, cuts RAM use by 99.9%

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A software developer created ESP32-HTTP-Client, an open-source C++ library designed to solve chronic memory management problems on ESP32 microcontrollers. Traditional approaches using HTTPClient and ArduinoJson typically allocate around 58 KB of heap per request, often causing crashes in complex embedded projects with Wi-Fi, Bluetooth, and multiple sensors. The new library uses streaming JSON parsing directly from the network socket and writes values straight into target C++ variables, eliminating intermediate buffers and temporary object trees. Benchmarks across 100 consecutive requests showed heap allocation drop from roughly 58 KB to about 15 bytes per request, while average response time fell from 750 ms to 59 ms thanks to persistent TLS Keep-Alive connections. The library has since gained users across multiple countries deploying it in real-world embedded projects.

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Apache Kafka: what it is, when to use it, and its key trade-offs

Apache Kafka is an open-source distributed messaging system that stores data streams in a durable, ordered, and fault-tolerant manner. Messaging platforms like Kafka allow multiple systems to exchange information asynchronously through an intermediary, without services calling each other directly. Kafka stands out from traditional brokers such as RabbitMQ and SQS because messages persist after being consumed, making it well suited for high-volume, real-time scenarios like e-commerce order processing and IoT sensor networks. Among its main advantages are high throughput, real-time processing, resilience, and support for multiple simultaneous consumers. However, Kafka can be overkill for low-traffic applications and carries a steep learning curve along with significant configuration and operational complexity.

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ProgrammingDEV Community ·

Anthropic Engineer Advises Deleting Claude.md Files as Opus 5 Needs Far Fewer Instructions

Boris Cherny, the engineer behind Claude Code, told a Y Combinator audience that users should periodically delete their CLAUDE.md files, custom skills, and hooks to let Opus 5 demonstrate its improved capabilities. Anthropic itself removed over 80% of Claude Code's internal system prompt before shipping the new model, having found that most instructions were compensating for limitations in earlier versions that no longer exist. Cherny explained that Anthropic used a line-by-line ablation process to determine which prompt instructions still carried weight and which had become redundant scaffolding. Opus 5's broader instruction retrieval, built-in self-verification, and long-horizon task handling mean that instruction files tuned for Claude 4.x can behave erratically on the newer model even without any changes by the user. Developers are advised to audit existing instruction files, as much of their content likely addressed past model weaknesses rather than encoding genuinely necessary guidance.

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ProgrammingHacker News ·

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ProgrammingDEV Community ·

Developer audited a 5.5 GB AI dataset by downloading less than 1% of it

A developer discovered a 5.5 GB Chinese astrology AI training dataset on a popular repository and grew suspicious when the sample count of 518,400 matched a perfect nested loop formula rather than real observations. Using HTTP range requests, they downloaded only 48 MB — about 0.8% of the total — by fetching the ZIP central directory and targeted file shards. The audit revealed that the dataset's 781 data shards appeared algorithmically generated rather than empirically collected. More strikingly, a proprietary content library explicitly excluded from the open-source GitHub repo was found bundled inside the release archive, buried nearly 6 GB deep where few would look. The case highlights both a practical technique for sampling large archives cheaply and a cautionary note about assuming release contents match what a repository publicly discloses.

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